Karen Deyoung David Filipov The Washington Post

For much of this year, Donald Trump and Vladimir Putin have been engaged in a long-distance courtship. They have said kind things about each other in public and separately expressed visions of a mutually agreeable future.

U.S.-Russia relations fell to a new post-Cold War low Monday as the Obama administration abandoned efforts to cooperate with Russia on ending the Syrian civil war and forming a common front against terrorists there, and Moscow suspended a landmark nuclear agreement.

For much of this year, Donald Trump and Vladimir Putin have been engaged in a long-distance courtship. They have said kind things about each other in public and separately expressed visions of a mutually agreeable future.

U.S.-Russia relations fell to a new post-Cold War low Monday as the Obama administration abandoned efforts to cooperate with Russia on ending the Syrian civil war and forming a common front against terrorists there, and Moscow suspended a landmark nuclear agreement.